Hi abbas,
To restore an ePO server from an dB, you need to know what version the DB was created with.
If the dB was created when you have ePO 5.1.3 for example then you need to collect the ePO 5.1.3 installation set and follow the on screen instructions.
I found a YouTube video that demonstrates how to perform a restore form an ePO dB, I hope it helps!
McAfee ePO Disaster Recovery: How to Backup and Restore
Some more information to help you with this operation can be reviewed in our Knowledge base, please search for and take a look at the following:
Overview of the ePolicy Orchestrator 5.x Disaster Recovery Snapshot feature
Technical Articles ID: KB87976
ePolicy Orchestrator server backup and disaster recovery procedure
Technical Articles ID: KB66616
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